When computer turns on, monitor activates for a second than goes black with a green flashing light. sometimes by unplugging the monitor for a few minutes and back in it will turn on, sometimes it doesn't.

When computer turns on, monitor activates for a second than goes black with a green flashing light. sometimes by unplugging the monitor for a few minutes and back in it will turn on, sometimes it doesn't.

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Since you hadd confirmed that the monitor is faulty with a swap then it seems that the input signal processor is faulty.
Only a signal test will confirm the fault in the stage , so check from the power supply section to see if the set has tripped off due to a protection- if so check the output drivers.

The flashing green power button is a well known electronic problem with this (and other) Viewsonic LCD monitors. There is YouTube video (do a search) showing how to disassemble the VX924 (very similar to the VX922) and find out whether the problem is related to blown capacitors. When I took my VX922 apart I discovered 6 bad capacitors out of a total of 7 on the power supply circuit board.

If there is a flashing led on front of the monitor, that indicates a fault condition.

The flashing light indicates a diagnostic state called protection.
When the Monitor goes on protection there are only two possible causes.

1
The internal circuits are jammed because of electrostatic charges
accumulating on capacitors, or because of a wrong voltage read by the
main chip on your monitor controller board. this started the protection
circuit.

2 The protection circuit detected a wrong voltage or a
broken contact, identified an internal fault and kicked in , starting
the flashing light.

If you are in situation one, then the
monitor will reset just unplugging power cord for one or two hours,
sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

Common
faults that can occurr suddenly are a blown capacitor on power board,
the inverter board powering up backlight lamp has blown, or a fault on
main lcd controller board.
check also the video cable, if the cable
is shorting, or the connector is bad, you can get same flashing state
because of the video cable.

Check connectors, try moving the video cable, and if the cable is not built in, then also try a replacement cable.

If there is a flashing led on front of the monitor, that indicates a fault condition.

The flashing light indicates a diagnostic state called protection.
When the Monitor goes on protection there are only two possible causes.

1
The internal circuits are jammed because of electrostatic charges
accumulating on capacitors, or because of a wrong voltage read by the
main chip on your monitor controller board. this started the protection
circuit.

2 The protection circuit detected a wrong voltage or a
broken contact, identified an internal fault and kicked in , starting
the flashing light.

If you are in situation one, then the
monitor will reset just unplugging power cord for one or two hours,
sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

Common
faults that can occurr suddenly are a blown capacitor on power board,
the inverter board powering up backlight lamp has blown, or a fault on
main lcd controller board.
check also the video cable, if the cable
is shorting, or the connector is bad, you can get same flashing state
because of the video cable.

Check connectors, try moving the video cable, and if the cable is not built in, then also try a replacement cable.

I have the same problem with my VX922 as do MANY others. The problem seems to be caused by leaking/bulging capacitors on the circuit board. The only solution is to replace the faulty capacitors either on your own (which is fairly easy if you're good with a soldering iron) or send it to Viewsonic and have them fix it.

you guys......you don't have a software (driver, refresh rate, etc.) problem. When you first power up the monitor, do you get any display at all (ex, "analog input" or "No input signal")? Of course not - that's because you have a hardware problem with the monitor. Go here and watch the youtube video on how to take apart your monitor and find and replace the "domed" capacitors that have blown:

Fortunately I only had 1 ($1.76 at Radio Shack). I replaced it in less than 30 minutes and my monitor showed "no input signal" upon powerup as expected because I wasn't connected to my pc which is full of all kinds of drivers and refresh settings, etc.

The flashing green power button is a well known electronic problem with
this (and other) Viewsonic LCD monitors. There
is a YouTube video (do a search) showing how to disassemble the VX924 and find out whether the problem is related
to blown capacitors. When I took my VX922 apart I discovered 6 bad
capacitors out of a total of 7 on the power supply circuit board.Only recommended for those handy with a soldering iron.